CN103675340A - Optical fiber accelerometer in differential double-grating structure - Google Patents
Optical fiber accelerometer in differential double-grating structure Download PDFInfo
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- CN103675340A CN103675340A CN201310712441.XA CN201310712441A CN103675340A CN 103675340 A CN103675340 A CN 103675340A CN 201310712441 A CN201310712441 A CN 201310712441A CN 103675340 A CN103675340 A CN 103675340A
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Abstract
The invention relates to an optical fiber accelerometer in a differential double-grating structure. The optical fiber accelerometer comprises an outer shell, mass blocks, tunable screws, a fixed bottom plate, fixing blocks, elastic sheets and optical fiber gratings, wherein fixing grooves which are arranged symmetrically in the vertical direction are formed in the two mass blocks; fixing grooves which are arranged symmetrically in the vertical direction are also formed in the two fixing blocks; one end of each optical fiber grating is fixed in the fixing groove of each mass block while the other end thereof is fixed in the fixing groove of each fixing block and penetrates from the fixing groove; the fixing blocks and the mass blocks are connected through the elastic sheets; the fixing blocks are mounted on the fixed bottom plate; the mass blocks are suspended; the outer shell and the fixed bottom plate are fixedly connected for sealing; the two tunable screws penetrate the outer shell and the fixed bottom plate to limit the mass blocks. The optical fiber accelerometer in the differential double-grating structure efficiently avoids the situation that a pressed grating has no stress output, improves measurement accuracy of the optical fiber accelerometer, avoids damage of the optical fiber accelerometer and enhances the strength of optical fiber gratings.
Description
Technical field
The present invention relates to a kind of fiber grating that utilizes as the fibre optic accelerometer of sensitive element, especially relate to a kind of fibre optic accelerometer of differential type double grating structure.
Background technology
Fibre optic accelerometer is based on optical signalling, to detect the Novel Accelerometer of displacement principle.Fibre optic accelerometer can be realized photodetachment, and sensing head and signal deteching circuit separate completely, has the feature of anti-electromagnetic interference (EMI) and remote measurement.Except acceleration analysis, fibre optic accelerometer also can be used for the network monitoring of structural vibration, and monitoring instruction and distant early warning.
Utilize fiber grating as the fibre optic accelerometer of sensitive element, adopt semi-girder and mass to treat that measuring acceleration converts the displacement of mass to, the strain causing by the responsive displacement of fiber grating, has advantages of that signal detecting method is simple, precision is higher.Impact for environment temperature on acceleration analysis, has developed differential optical fiber accelerometer.Adopt two symmetrical fiber gratings of installing to carry out the displacement of measurement quality piece; When under acceleration effect, mass produces displacement, the strain of symmetrical hard-wired two fiber gratings and wavelength variations equal and opposite in direction, opposite direction; When variation of ambient temperature, the wavelength variations equal and opposite in direction of two fiber gratings, direction are identical; By the wavelength of measuring between symmetrical hard-wired two fiber gratings, relatively change and just can measure the size of acceleration, can also suppress the impact of variation of ambient temperature simultaneously.
The existing fiber grating that utilizes is as the fibre optic accelerometer of sensitive element, the range of fibre optic accelerometer is limited to the ability of the pulling strengrth that fiber grating can bear, if will obtain the stretch-proof ability that the fibre optic accelerometer of relatively large journey will improve fiber grating; If the acceleration loading is excessive, can produce larger strain to the fiber grating being arranged on mass, once surpass the strain limit that fiber grating can bear, can cause fiber grating to be pulled off with fibre optic accelerometer and damage.Meanwhile, the mounting means of 2 fixing fiber gratings that adopt at present can occur when having acceleration to load that the fiber grating of being pressed is without the situation of strain output, and this has brought larger problem to Measurement accuracy.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, a kind of fibre optic accelerometer of differential type double grating structure is provided, this fibre optic accelerometer effectively avoids pressurized grating without the situation of strain output, improved the measurement accuracy of fibre optic accelerometer, avoid the damage of fibre optic accelerometer simultaneously, strengthen the intensity of fiber grating, and improved the reliability of fibre optic accelerometer.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A kind of fibre optic accelerometer of differential type double grating structure, comprise shell, two masses, two tunable screws, fixed base plate, two fixed blocks, flexure strip and two fiber gratings, wherein on two masses, all have pickup groove, and upper and lower symmetrical placement, on two fixed blocks, also all have pickup groove, and upper and lower symmetrical placement, one end of two fiber gratings is individually fixed in the pickup groove of two masses, and the other end is individually fixed in the pickup groove of two fixed blocks and passes from described pickup groove; Fixed block is connected by flexure strip with mass, fixed block is installed on solid roof and floor, mass is unsettled, shell is fixedly connected with solid roof and floor by mass, fixed block and flexure strip sealing wherein, one end of two fiber gratings is through shell protruding, and two tunable screws carry out spacing through shell and fixed base plate to mass respectively.
In the fibre optic accelerometer of above-mentioned differential type double grating structure, the outside surface of two fiber gratings is provided with overlay, and the thickness of overlay is 50～100 μ m.
In the fibre optic accelerometer of above-mentioned differential type double grating structure, the overlay of two fiber grating outside surfaces is polyimide material.
In the fibre optic accelerometer of above-mentioned differential type double grating structure, two tunable screws are separately fixed on shell and fixed base plate the position corresponding to mass, and the diameter of tunable screw is greater than the width of the pickup groove of installing optical fibres grating on mass.
In the fibre optic accelerometer of above-mentioned differential type double grating structure, the spacing range between tunable screw and mass is 0～0.5mm.
In the fibre optic accelerometer of above-mentioned differential type double grating structure, fiber grating has carried out prestrain loading when mounted, and adopts bonded adhesives to be fixed at the two ends of fiber grating.
The present invention compared with prior art has following beneficial effect:
(1), the present invention has designed a kind of fibre optic accelerometer of brand-new differential type double grating structure, by utilizing mass upper and lower displacement amplitude in adjustment screw limit fibre accelerometer, avoid fiber grating strain to surpass the work strain scope of permission and cause fibre optic accelerometer to damage, having improved the reliability of fibre optic accelerometer; In addition by the spacing between set screw termination and mass, make method of operating simple, technical difficulty is less, has reduced the technical difficulty that design complex mechanical structure brings;
(2), the fibre optic accelerometer of differential type double grating structure of the present invention is by carrying out polyimide coating on fiber grating surface, and applied thickness is optimized, its stretch-proof ability is enhanced, further strengthen the intensity of fiber grating, and greatly improved range and the security of fibre optic accelerometer;
(3), the fibre optic accelerometer of differential type double grating structure of the present invention is by when fiber grating is installed, it being loaded to a certain amount of prestrain, the pressurized grating of effectively avoiding, without the situation of strain output, has improved the measurement accuracy of fibre optic accelerometer.
Accompanying drawing explanation
Fig. 1 is the side view of the fibre optic accelerometer of differential type double grating structure of the present invention;
Fig. 2 is the structure front elevation of the fibre optic accelerometer of differential type double grating structure of the present invention;
Fig. 3 be after the fibre optic accelerometer of differential type double grating structure of the present invention removes base plate and shell tunable screw to mass position-limiting action schematic diagram;
Fig. 4 is the schematic diagram that the sensitive optical fibre grating in the fibre optic accelerometer of differential type double grating structure of the present invention carries out polyimide coating;
Fig. 5 is the installation of sensitive optical fibre grating and the loading schematic diagram of prestrain in the fibre optic accelerometer of differential type double grating structure of the present invention;
Description of reference numerals:
1 ... shell, 2 ... mass, 3 ... tunable screw, 4 ... Gu roof and floor, 5 ... fixed block, 6 ... flexure strip, 7 ... fiber grating, 8 ... polyimide coating layer, 9 ... bonded adhesives
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Be illustrated in figure 1 the side view of the fibre optic accelerometer of differential type double grating structure of the present invention, Figure 2 shows that the structure front elevation of the fibre optic accelerometer of differential type double grating structure of the present invention, the fibre optic accelerometer of differential type double grating structure of the present invention comprises shell 1 as seen from the figure, two masses 2, two tunable screws 3, fixed base plate 4, two fixed blocks 5, flexure strip 6 and two fiber gratings 7, wherein on two masses 2, all have pickup groove and upper and lower symmetrical placement, on two fixed blocks 5, also all have pickup groove and upper and lower symmetrical placement, one end of two fiber gratings 7 is individually fixed in the pickup groove of two masses 2, the other end is individually fixed in the pickup groove of two fixed blocks 5 and passes from pickup groove.Fixed block 5 is connected by flexure strip 6 with mass 2, and fixed block 5 is installed on solid roof and floor 4, and mass 2 is freely unsettled.
Shell 1 seals mass 2, fixed block 5 and flexure strip 6 wherein with solid roof and floor 4 mechanical connections, and one end of two fiber gratings 7 is through shell 1 protruding, and two tunable screws 3 carry out spacing through shell 1 and 4 pairs of masses of fixed base plate 2 respectively.
After the fibre optic accelerometer that is illustrated in figure 3 differential type double grating structure of the present invention removes base plate and shell, tunable screw is to mass position-limiting action schematic diagram, at fixed base plate 4 and shell 1, corresponding to the position of mass 2, a threaded hole is set respectively, for avoiding breaking grating, the diameter that is screwed into the tunable screw 3 of threaded hole is greater than the width of the pickup groove of installing optical fibres grating 7 on mass 2, and the spacing range between tunable screw 3 and mass 2 is 0～0.5mm.By the spacing between tunable screw 3 terminations and mass 2 end faces, control the amplitude that mass 2 can upper and lower displacement, the strain of limit fibre grating 7 is no more than its work strain scope and causes fibre optic accelerometer to damage, and has also realized the tunable of fibre optic accelerometer range simultaneously.
For example fibre optic accelerometer of the present invention adopts the fiber grating 7 of work strain scope 0～5000 μ ε as sensitive element, and the in the situation that of acceleration 10g, the displacement of mass 2 is that the strain of 0.25mm, fiber grating 7 is 2500 μ ε; By tunable screw 3, the displacement amplitude of mass is limited in to 0.25mm, has protected the range of 10g, again the strain of fiber grating 7 is limited in to 0～2500 μ ε, guaranteed the trouble free service of fiber grating 7.
Be illustrated in figure 4 the schematic diagram that sensitive optical fibre grating in the fibre optic accelerometer of differential type double grating structure of the present invention carries out polyimide coating, the outside surface of two fiber gratings 7 is provided with overlay 8, for example overlay 8 is polyimide material, and the thickness of overlay 8 is 50-100 μ m.Method is dipped in the present invention's employing or sedimentation evenly applies one deck polyimide material at uncoated ordinary optic fibre grating surface, the stretch-proof performance of the fiber grating 7 that process applies can improve a lot than the fiber grating of uncoated or common coating, its strain energy that can bear has been brought up to 10000 μ ε, work strain scope is 0～5000 μ ε, and this security that had both increased fibre optic accelerometer has also improved the range of fibre optic accelerometer simultaneously.
Be illustrated in figure 5 the installation of sensitive optical fibre grating and the loading schematic diagram of prestrain in the fibre optic accelerometer of differential type double grating structure of the present invention, fiber grating 7 has carried out prestrain loading when mounted, and adopts glue 9 to be fixed at the two ends of fiber grating 7.
Sensitive optical fibre grating 7 in fibre optic accelerometer of the present invention is arranged in the pickup groove of mass 2 and fixed block 5, when installing optical fibres grating 7, the prestrain that fiber grating 7 has been applied to fixed value can effectively normally be worked at certain measurement range inner fiber grating 7 guaranteeing.Installation process is: first adopt the bonded adhesives 9 of high elastic modulus and high adhesiveness energy that one end of fiber grating 7 is fixed; After bonded adhesives 9 has solidified, then by the other end of stretching optical fiber grating 7, it is loaded to prestrain, it is relevant that the size of the prestrain that loads and fiber grating 7 bear strain intensity; When loading strain, with the other end of 9 pairs of fiber gratings of bonded adhesives, be fixed stickup; The strain that removal loads after bonded adhesives 9 solidifies, in order to improve reliability, affixed points has been carried out Redundancy Design, and every end of fiber grating has two point of fixity, as shown in Figure 5.Because fiber grating 7 is fixed the in the situation that of strained stretching, so even the strain that loads remove, between two point of fixity, also retained the prestrain applying, so just successfully realized the installation of fiber grating 7 and prestrain loading.
The above; only be the embodiment of the best of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
The content not being described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (6)
1. the fibre optic accelerometer of a differential type double grating structure, it is characterized in that: comprise shell (1), two masses (2), two tunable screws (3), fixed base plate (4), two fixed blocks (5), flexure strip (6) and two fiber gratings (7), wherein on two masses (2), all have pickup groove, and upper and lower symmetrical placement, on two fixed blocks (5), also all have pickup groove, and upper and lower symmetrical placement, one end of two fiber gratings (7) is individually fixed in the pickup groove of two masses (2), the other end is individually fixed in the pickup groove of two fixed blocks (5) and passes from described pickup groove, fixed block (5) is connected by flexure strip (6) with mass (2), fixed block (5) is installed on solid roof and floor (4), mass (2) is unsettled, shell (1) is fixedly connected with solid roof and floor (4) by mass (2), fixed block (5) and flexure strip (6) sealing wherein, one end of two fiber gratings (7) is through shell (1) protruding, and two tunable screws (3) carry out spacing through shell (1) and fixed base plate (4) to mass (2) respectively.
2. the fibre optic accelerometer of a kind of differential type double grating structure according to claim 1, is characterized in that: the outside surface of described two fiber gratings (7) is provided with overlay (8), and the thickness of overlay (8) is 50～100 μ m.
3. the fibre optic accelerometer of a kind of differential type double grating structure according to claim 2, is characterized in that: the overlay (8) of described two fiber gratings (7) outside surface is polyimide material.
4. the fibre optic accelerometer of a kind of differential type double grating structure according to claim 1, it is characterized in that: described two tunable screws (3) are separately fixed at shell (1) and the upper position corresponding to mass (2) of fixed base plate (4), and the diameter of tunable screw (3) is greater than the width of the pickup groove of the upper installing optical fibres grating (7) of mass (2).
5. according to the fibre optic accelerometer of a kind of differential type double grating structure described in the arbitrary claim of claim 1～4, it is characterized in that: the spacing range between described tunable screw (3) and mass (2) is 0～0.5mm.
6. the fibre optic accelerometer of a kind of differential type double grating structure according to claim 1, is characterized in that: described fiber grating (7) has carried out prestrain loading when mounted, and adopts bonded adhesives (9) to be fixed at the two ends of fiber grating (7).
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| CN201310712441.XA CN103675340B (en) | 2013-12-20 | 2013-12-20 | The optical fiber acceleration meter of a kind of differential type bigrating structures |
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| CN201310712441.XA CN103675340B (en) | 2013-12-20 | 2013-12-20 | The optical fiber acceleration meter of a kind of differential type bigrating structures |
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Cited By (8)
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| CN104296856A (en) * | 2014-08-20 | 2015-01-21 | 西安石油大学 | Sensitization platform fiber bragg grating vibration sensor |
| CN105403338A (en) * | 2015-11-04 | 2016-03-16 | 上海大学 | Optical fiber compressed device |
| CN105510631A (en) * | 2016-01-11 | 2016-04-20 | 昆明理工大学 | High-frequency acceleration sensor with optical fiber Bragg gratings and application method of high-frequency acceleration sensor |
| CN105842479A (en) * | 2016-06-03 | 2016-08-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber grating acceleration sensor with integrated differential structure |
| CN109470885A (en) * | 2018-10-19 | 2019-03-15 | 浙江大学 | A kind of single-chip integration optics accelerometer |
| CN109682523A (en) * | 2019-02-20 | 2019-04-26 | 天津师范大学 | Optical fibre grating acceleration sensor and application for the measurement of stem slamming load |
| CN110133324A (en) * | 2019-06-05 | 2019-08-16 | 华北水利水电大学 | A kind of differential optical fiber grating acceleration sensing device |
| CN110221096A (en) * | 2019-07-16 | 2019-09-10 | 蚌埠学院 | A kind of limit-type fiber grating accelerometer based on cross force of fin |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296856A (en) * | 2014-08-20 | 2015-01-21 | 西安石油大学 | Sensitization platform fiber bragg grating vibration sensor |
| CN104296856B (en) * | 2014-08-20 | 2018-02-23 | 西安石油大学 | Enhanced sensitivity platform optical fiber raster vibration sensor |
| CN105403338A (en) * | 2015-11-04 | 2016-03-16 | 上海大学 | Optical fiber compressed device |
| CN105510631A (en) * | 2016-01-11 | 2016-04-20 | 昆明理工大学 | High-frequency acceleration sensor with optical fiber Bragg gratings and application method of high-frequency acceleration sensor |
| CN105842479A (en) * | 2016-06-03 | 2016-08-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber grating acceleration sensor with integrated differential structure |
| CN109470885A (en) * | 2018-10-19 | 2019-03-15 | 浙江大学 | A kind of single-chip integration optics accelerometer |
| CN109470885B (en) * | 2018-10-19 | 2020-11-24 | 浙江大学 | Monolithic integrated optical accelerometer |
| CN109682523A (en) * | 2019-02-20 | 2019-04-26 | 天津师范大学 | Optical fibre grating acceleration sensor and application for the measurement of stem slamming load |
| CN110133324A (en) * | 2019-06-05 | 2019-08-16 | 华北水利水电大学 | A kind of differential optical fiber grating acceleration sensing device |
| CN110133324B (en) * | 2019-06-05 | 2022-05-06 | 华北水利水电大学 | Differential type fiber bragg grating acceleration sensing device |
| CN110221096A (en) * | 2019-07-16 | 2019-09-10 | 蚌埠学院 | A kind of limit-type fiber grating accelerometer based on cross force of fin |
| CN110221096B (en) * | 2019-07-16 | 2022-04-12 | 蚌埠学院 | Convex edge limiting type fiber bragg grating accelerometer based on transverse force |
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